Grinding machine



Jam., 2, 1923. LMQ

- M. o. REEVES.

GRINDING MACHINE.

FHIED MAY 19 191 9 2 sHEETs-sHEET 1 Jam. 2, 11923, 11A-411111,79@

M. O'. REEVES GRINDI'NG MACHINE. F1 LED MAY 19, 191 9y 2 SHEETS-SHEET 2www@ @HTM/newy- Patented dan. 2, 1923.

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MILTON O. REEVES, OF COLUMBUS, INDIANA, ASSIGNOR '.liO REEVESlPII'LLlEIYv COMPANY, OF COLUMBUS, INDIANA, A CORPORATION OF INDIANA.

GRINDING MACHINE.

Applicationl led May 19,

To all whom t may concer/n.'

Be it known that I, MILTON 0. REEVES, a citizen of the United States,residing at Columbus, in the county of Bartholomew and State of-Indiana, have invented a new and useful Grinding Machine, of which thefollowing is a specification.

It is the object of my invention to provide a grinding machine foraccurately grinding round articles, of, any size, and whethercylindrical or conical, with precision, and especiall one wherein thestarting or stopping o the grinding action on such round articles, orboth the starting Cand the stoppingv thereof; may be accurately m'adealong a considerable length or the entire length of such articles byputting them transversely into or out of grinding position, whereby thegrinding is not affected by any slight inaccuracies at isolated pointsin the original shapes of such articles.

My present invention is in some respects based on that set forth in myprior vPatent N o. 1,264,129, granted April 23, 1918. The accompanyingdrawings illustrate my invention. In such drawings, Fig. 1 is a frontelevation of a grinding machine embodying my invention; 2 is a sectionon the line 2 2 of Fig. 1; i 3 is a section on the line 3--3 of Fig. 1;ig. 4 is an enlarged front elevation of the dressing device of thegrinding wheel; and Fig. 5 is a plan of the mounting of the slide bar ofsuch.

dressing device. f

On the base 10 are carried three adjustable frames 11, 12, an-d 13, thefirst of which is adjustable vertically by an adjusting wheel 14 and theother two of which are independently adjustable longitudinally of thebase 10 by a crank 15 and a hand wheel 16 respectively. One or the otherof `the frames 11 and 12, or both of them, are also adjustable angularlyabout a vertical axis. As shown, this angularly adjustable frame is theframe 11, which for this purpose is mounted on a sub-frame 11 on whichit is vertically. adjustable by the hand wheel 14, and this sub-frame 11is angularly adjustable, as shown about a vertical driving shaft 9extending upward from the base 10, by adjusting screws 8 carried byupwardly extending fingers 7 from the base 10 and (5o-operating with theedges of the subframe 11. The frames 11, 11', and 12 are 1919. SerialNo. 298,098.

arranged to be clamped in adjusted position by suitable clamping screws17, 17', and 18 respectively. rlhe vertically adjustable frame 11carries a longitudinally extending horizontal shaft 19, which in thiscase is driven from the vertical driving shaft 11 by any suit-ablegearing, such as a worm gearing, which does not interfere with thevertical adjustment of the frame 11. On its end toward the frame 12, theshaft 19 has mounted lthereon a wheel 20, preferably an abrasive wheel,whichI on one end has an annular face 21. The wheel 20 is the feedwheel, and in the grinding operation is driven at a comparatively slowspeed in the direction of the arrow. The longitudinally adjustable frame12 is adjustable toward and from thefeed wheel 20 by the crank 15, andfor accuracy of adjustment, to take up alllost motion, is associatedwith a weight 15 which tends to move it away from the feed wheel and soholds it to one limit of the lost motion which would otherwise bepermitted by its adjusting mechanism. This frame 12 carries a horizontalshaft 22 transverse to the direction of adjustment of such frame and tothe shaft 19, but the horizontal angle between such two shafts isslightly variable by the screws 8. The shafts 19 and 22 may be driven inany suitable way which allows the adjustment of the frames 11 and 12,the shaft 19 being shown as being driven from the vertical shaft 9,though thls is not essential. The shaft 22 carries an abrasive wheel 23,ha'ving a peripheral grinding face 24, and is driven at comparativelyhigh s eed in the direction o'fthe arrow. The a rasive wheel 23 is thegrinding wheel. The peripheral face 24jof the grinding wheel 23 where itmoves ldownward opposesthe annular working face 21 of the feed wheel 20where it moves upward, to provide between them a grinding throat inwhich the grinding of the round articles 25 occurs. The width of thisgrinding throat is adjustable by shifting the frame 12 by the crank 15.The narrow point of the grinding throat is in the horizontal planethrough the aXis.of the grinding wheel '23 when the face 21 is flat andvertical,`as l usually have it, as such plane is then perpendicula/r tothe working face 21 ofI the feed wheel 20 at the grinding throat. lTheheight of the shaft 19 with respect to this horizontal plane isadjustable by the hand wheel 14, to get any desired variation fromvertical in the direction of movement of the face 21 at such plane inorder to get when desired a feed componentv of such movement along thegrinding throat. The angle between the two abrasive surfaces 21 and 24at the grinding throat may be adjusted 4by the screws 8 to make suchsurfaces parallel or slightly converging, the convergence being usuallytoward the back of the machine; this makes it possible togrindcylindrical or slightly conical articles as desired. i

The round articles 25 lto be ground are supported in the grinding throaton a feed bar 30, which is carried by the longitudinally adjustableframe 13, on which bot-h ends of the feed bar are supported. To obtainthis support, the frame 13 is in the shape of an inverted horseshoe, asis apparent from Fi 2. The rear end of the feed bar is pivota-llymounted "on the rear prong of this horseshoe, on a pivot bolt 31 whichis carried by a slide 32 which is vertically adjustable by a temperscrew 33. The front end of the feed bar 30 rests on the short end of alever 34 and overlaps the pivot point 35 of such lever, and this leveris carried by a slide 36 which is vertically adjustable by a temperscrew 37. The feed bar as a whole may be vertically adjusted by thetemper screws 33 and 37. In addition, it may be tilted" by rais-ing andlowering its front end by the lever 34, the downward limit of suchtilting movement being when the lower edge of such feed bar rests on theupper edge `of the short end of suoli lever to a point above the pivotalcenter 35 of such lever. The front end of the feed bar 30 is guided inits movements by a bolt 38 carried by the slide 36 and (3o-operatingwith an arc-shaped slot 39 vin said feed bar. The feed bar 30 may beprovided on its upper face with a stop 40, which is preferably removablebut which when in place projects up behind an article 25 to be ground tolimit the movement of such article along such feed bar.l This stop 40 isused or Ais omitted in accordance with the nature of the work beingground, as is hereinafter apparent. The feed bar may be made in a singlepiece, such as for the sake of simplicity is shown-in the drawings; ormay have any desired removable and replaceable and adjustable parts,such as some or all of those set forth in my co-pending application Ser.No. 298,007, of even filing date herewith.

The vertically adjustable frame 11 and the longitudinally adjustableframe 12 are provided with suitable dressing devices 60 and 61respectively, for dressing the work- -ing surfaces 21 and 24 of thewheels 20 and 23 for any positions of such frames, so that such dressingmay be done without disturbthese dressing devices comprises a cuttingdiamond 62, carried in a suitable movable Y frame 63 so that the depthof cut may be adjusted by an adjusting screw 64 and the movable frame63Y maybe moved along a suitable slideway 65 by a hand wheel 66 to causethe cutting diamond to travel across the face 21 or 24 to true it. Theangle of one or both of the slideways 65 may be made adjustable withrelation to the axis of the associated wheel. As shown, the slideway 65for the grinding wheel 23 is shown Vas rthe one which is so adjustable.This adjustability may be obtained in various ways, but it is shown asbeing obtained bymounting the slideway 65 at each end on a supportingbar 67 by two screws 68 provided with lock nuts and extending from theslideway 65 through the 'supporting bar 67, and a push screw 69 locatedbetween the two screws 68 and acting to push the associated end of theslideway 65 away 'from its supporting bar 67. By

manipulating the screws 68 and 69, either 22, so that by such adjustmentand the sub-- sequent manipulation of the associated hand wheel 66 theface 24 may be made either cylindrical orslightly conical as required.This gives another means for making the two working faces 21l and 24 atthe grinding throat parallel or converging. This control of the relationof these cutting faces at the grinding throat may be obtained by eithervarying the surface 24 or by manipulating the screws 28 to vary theyhorizontal angle of the shaft 19, o-'r by both, supplnenting each other.

In operation, the feed bar 30 is raised by `the lever 34, and thearticle 25 to be ground is placed upon it above the grinding throat.Then by manipulation of the lever 34 such feed bar is lowered to bringthe 'article 25 to be ground into the grinding throat. The article isthen caught between the faces 21 and 24, which have previously beenadjusted into the desired relationship to each other, and is slowlyrotated by their combined action, but particularly by the feed face 21,and is very accurately ground -to roundness by the grinding face 24.This roundness may be either cylindrical or conical, as desired,depending upon the relation of the faces 21 and 24 as controlled by thescrews 8, 68, and 69, and by the hand wheel 14. If the article 25 iscylindrical, the stop 40 need not be used on the feed bar 30, but thearticle 35 may be allowed to take llO any position it wishes along thethroat. Indeed, I frequently prefer to have the article 25 fed along thethroat and discharged therefrom by a forward feeding action obtainedfrom the face 21, in which case the faces 21 and 24 at the grindingthroat may be either parallel or converged. This forward feeding actionis obtained by adjusting the height of the shaft 19 by the hand wheel-14so that the axis of such shaft is slightly below the horizontal plane ofthe grinding throat and of the axis of the grinding wheel 23, as thenthe movement of the face 21 at such horizontal plane where it operateson such article 25' has a slight component lengthwise of the throat andfeeds the article along the throat. If the cylindrical article is notfed along the grinding throat, the faces 21 and 24 are parallel at suchthroat, and the article 25 when ground is removed from the grindingthroat by tilting the feed bar upward. In grinding conical articles,however, the two surfaces 21 and 24 are convergent along the grindingthroat; then I prefer to use the stop 40, so as to hold the articles 25in a definite position on such throat. vAt the same time, I may adjustthe axis of the sha-ft, 19 so that it lies in the horizontal plane ofsuch throat, in which case there is no feeding component given to thearticle 25 tending to move it along such throat, or I may adjust suchshaft 19 so that its axis is slightly below such horizontal plane inorder`to produce a slight feeding component on the article 25 justsufficient to hold it firmly against the stop 40.

In grinding conical articles, the article when ground is removed bytilting the feed bar 30 upward by the lever 34. This may also be donewith cylindrical articles, especially when the stop 40 is used, as maybe done, though in grinding cylindrical articles the stop 40 may beomitted and the articles discharged from the throat by being fed alongthe throat by a feedingaction of the feed wheel 2l.

I claim `as my invention:

l. In a grinding machine, the-combination of a grinding wheel having aperipheral grinding face, a feed wheel having an annular end face, theaxes of said two wheels being transverse to each other and arranged sothat a point on the grinding face of the grinding-wheel opposes a pointon the feed face of the feed wheel to form a grinding throat betweenthem, and a feed bar for supporting articles to be ground insaidgrinding throat, the axes of said two wheels being relatively adjustableto vary the angular relation of the faces of said wheels at the grindingthroat.

2. In a grinding machine, the combination of a. grinding wheel having aperipheral grinding face, a feed wheel having an annular end face, theaxes of said two wheels being transverseto each other and arranged sothat a point on the grinding face of the grinding wheel opposes a. pointon the feed face of the feed wheel to form a grinding throat betweenthem, and a feed bar for supporting articles to be ground in saidgrinding throat, the axis of said feed wheel being angularly adjustableabout an axis transverse to the axes of both wheels.

3. In a grinding machine, the combination of a rind-ing wheel having` aperipheral grinding face, a feed Wheel having an annular end face, theaxes of said two wheels being-transverse to each other and arranged sothat a point on the grinding face of the grinding wheel opposes a pointon the feed face of the feed wheel to form a grinding throat betweenthem, and means for varying the' angle between the peripheral grindingface of the grinding wheel and the annular end face of the feed Wheel atsuch grinding throat.

In witness whereof,`I have hereunto set my lfand at Indiana olis,Indiana, this 15th day of May, A. one thousand nine hundred andnineteen.

MILTON U. REEVES.

